TGE operates the Register of Guarantees of Origin and organises trade in guarantees of origin. The Register of Guarantees of Origin was launched in September 2014. The Register of Guarantees of Origin supports records of energy from renewable sources and OTC trade in environmental benefits of such production. Contrary to certificates of origin, guarantees do not involve property rights or a support scheme for renewable energy sources; they are offered for information only. Purchase of guarantees is not mandatory but guarantees are acquired by organisations which need to prove that a certain quantity of their energy consumption originated from renewable sources. Since November 2014, TGE also offers trade in guarantees of origin of energy.